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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66e84e0abb64bc4a789db02617b083d41b8becafe3bbc01a72571ed37151dcb' 
  AND token = '7OUZ72IGwhxE/0KZxgN+cRmyBDaXscR7UTdOr8uvdEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}